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Code Issues Releases Wiki Activity

Creation of Font class and code update accordingly

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Pierre-Yves Rollo
2018-07-08 20:36:34 +02:00
parent 23bcd70199
commit c6cad702bc
7 changed files with 533 additions and 343 deletions
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295
font_api/init.lua
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@ -23,293 +23,12 @@
font_api = {}
font_api.name = minetest.get_current_modname()
font_api.path = minetest.get_modpath(font_api.name)
font_api.registered_fonts = {}
-- Local variables
------------------
-- Inclusions
-------------
local default_font = false
-- Local functions
------------------
-- Split multiline text into array of lines, with <maxlines> maximum lines.
local function split_lines(text, maxlines)
local splits = text:split("\n")
if maxlines then
local lines = {}
for num = 1,maxlines do
lines[num] = splits[num]
end
return lines
else
return splits
end
end
-- Gets a default (settings or fist font)
local function get_default_font()
-- First call
if default_font == false then
default_font = nil
-- First, try with settings
local settings_font = minetest.settings:get("default_font")
if settings_font ~= nil and settings_font ~= "" then
default_font = font_api.registered_fonts[settings_font]
if default_font == nil then
minetest.log("warning", "Default font in settings (\""..
settings_font.."\") is not registered.")
end
end
-- If failed, choose first font
if default_font == nil then
for _, font in pairs(font_api.registered_fonts) do
default_font = font
break
end
end
-- Error, no font registered
if default_font == nil then
minetest.log("error",
"No font registred, unable to choose a default font.")
end
end
return default_font
end
-- Returns font properties to be used according to font_name
local function get_font(font_name)
local font = font_api.registered_fonts[font_name]
if font == nil then
local message
if font_name == nil then
message = "No font given"
else
message = "Font \""..font_name.."\" unregistered"
end
font = get_default_font()
if font ~= nil then
minetest.log("info", message..", using font \""..font.name.."\".")
end
end
return font
end
-- Returns next char, managing ascii and unicode plane 0 (0000-FFFF).
local function get_next_char(text, pos)
local msb = text:byte(pos)
-- 1 byte char, ascii equivalent codepoints
if msb < 0x80 then
return msb, pos + 1
end
-- 4 bytes char not managed (Only 16 bits codepoints are managed)
if msb >= 0xF0 then
return 0, pos + 4
end
-- 3 bytes char
if msb >= 0xE0 then
return (msb - 0xE0) * 0x1000
+ text:byte(pos + 1) % 0x40 * 0x40
+ text:byte(pos + 2) % 0x40,
pos + 3
end
-- 2 bytes char (little endian)
if msb >= 0xC2 then
return (msb - 0xC2) * 0x40 + text:byte(pos + 1),
pos + 2
end
-- Not an UTF char
return 0, pos + 1
end
-- API functions
----------------
-- Computes text size for a given font and text (ignores new lines)
-- @param font_name Font to be used
-- @param text Text to be rendered
-- @return Rendered text (width, height)
function font_api.get_text_size(font_name, text)
local char
local width = 0
local pos = 1
local font = get_font(font_name)
if font == nil then
return 0, 0
else
while pos <= #text do
char, pos = get_next_char(text, pos)
-- Replace chars with no texture by the NULL(0) char
if font.widths[char] ~= nil then
width = width + font.widths[char]
else
width = width + font.widths[0]
end
end
end
return width, font.height
end
--- Builds texture part for a text line
-- @param font_name Font to be used
-- @param text Text to be rendered
-- @param width Width of the texture (extra text is not rendered)
-- @param x Starting x position in texture
-- @param y Vertical position of the line in texture
-- @return Texture string
function font_api.make_line_texture(font_name, text, width, x, y)
local texture = ""
local char
local pos = 1
local font = get_font(font_name)
if font ~= nil then
while pos <= #text do
char, pos = get_next_char(text, pos)
-- Replace chars with no texture by the NULL(0) char
if font.widths[char] == nil then
print(string.format("["..font_api.name
.."] Missing char %d (%04x)",char,char))
char = 0
end
-- Add image only if it is visible (at least partly)
if x + font.widths[char] >= 0 and x <= width then
texture = texture..
string.format(":%d,%d=font_%s_%04x.png",
x, y, font.name, char)
end
x = x + font.widths[char]
end
end
return texture
end
--- Builds texture for a multiline colored text
-- @param font_name Font to be used
-- @param text Text to be rendered
-- @param texturew Width of the texture (extra text will be truncated)
-- @param textureh Height of the texture
-- @param maxlines Maximum number of lines
-- @param halign Horizontal text align ("left"/"center"/"right") (optional)
-- @param valign Vertical text align ("top"/"center"/"bottom") (optional)
-- @param color Color of the text (optional)
-- @return Texture string
function font_api.make_multiline_texture(font_name, text, width, height,
maxlines, halign, valign, color)
local texture = ""
local lines = {}
local textheight = 0
local y, w, h
for num, line in pairs(split_lines(text, maxlines)) do
w, h = font_api.get_text_size(font_name, line)
lines[num] = { text = line, width = w, height = h, }
textheight = textheight + h
end
if #lines then
if valign == "top" then
y = 0
elseif valign == "bottom" then
y = height - textheight
else
y = (height - textheight) / 2
end
end
for _, line in pairs(lines) do
if halign == "left" then
texture = texture..
font_api.make_line_texture(font_name, line.text, width,
0, y)
elseif halign == "right" then
texture = texture..
font_api.make_line_texture(font_name, line.text, width,
width - line.width, y)
else
texture = texture..
font_api.make_line_texture(font_name, line.text, width,
(width - line.width) / 2, y)
end
y = y + line.height
end
texture = string.format("[combine:%dx%d", width, height)..texture
if color then texture = texture.."^[colorize:"..color end
return texture
end
--- Register a new font
-- Textures corresponding to the font should be named after following patern :
-- font_<name>_<code>.png
-- <name> : name of the font
-- <code> : 4 digit hexadecimal unicode of the char
-- @param font_name Name of the font to register
-- If registering different sizes of the same font, add size in the font name
-- (e.g. times_10, times_12...).
-- @param height Font height in pixels
-- @param widths Array of character widths in pixels, indexed by UTF codepoints
function font_api.register_font(font_name, height, widths)
if font_api.registered_fonts[font_name] ~= nil then
minetest.log("error", "Font \""..font_name.."\" already registered.")
return
end
if height == nil or height <= 0 then
minetest.log("error", "Font \""..font_name..
"\" must have a positive height.")
return
end
if type(widths) ~= "table" then
minetest.log("error", "Font \""..font_name..
"\" must have a widths array.")
return
end
if widths[0] == nil then
minetest.log("error", "Font \""..font_name..
"\" must have a char with codepoint 0 (=unknown char).")
return
end
font_api.registered_fonts[font_name] =
{ name = font_name, height = height, widths = widths }
-- Force to choose again default font
-- (allows use of fonts registered after start)
default_font = false
end
dofile(font_api.path.."/font.lua")
dofile(font_api.path.."/registry.lua")
--- Standard on_display_update entity callback.
-- Node should have a corresponding display_entity with size, resolution and
@ -325,11 +44,9 @@ function font_api.on_display_update(pos, objref)
if entity and ndef.display_entities[entity.name] then
local def = ndef.display_entities[entity.name]
local font = get_font(def.font_name)
local font = font_api.get_font(meta:get_string("font") or def.font_name)
objref:set_properties({
textures={font_api.make_multiline_texture(
def.font_name, text,
textures={font:make_text_texture(text,
def.size.x * def.resolution.x * font.height,
def.size.y * def.resolution.y * font.height,
def.maxlines, def.halign, def.valign, def.color)},